Vulcanizing-flask for dentists.



W. E. PAPPERT.

VULCANIZlNG FLASK FOR DENTISTS. APPLICATIION FILED JULY 11, 1914.

' WILLIAM E. PAPPERT, OF NEW YORK, N. Y.

FFIG.

VULGANIZING-FLASK FOR DEN TISTS.

Specification of Letters Patent.

Patented July 6, 1915.

Application filed July 11, 1914. Serial N 0. 850,307.

To all whom it may concern:

Be it known that I, WILLIAM E. PAPPERT, a citizen of the United States, and a resident of the city of New York, in the county and State of New York, have invented a certain new and useful Improvement in Vulcanizing-Flasks for Dentists, of which the following is a specification.

The object of the invention is to produce a vulcanizing flask for dentists in which the parts can be readily assembled and in which the pressure of the upper and lower parts of the flask can be gradually and automatically applied as the vulcanizing operation proceeds.

As showing a specific embodiment of the invention reference is made to the drawing, in which Figure 1 is a perspective view of the flask; Fig. 2is a plan View of the cover of the flask; Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2; Fig. 4 is a plan View of the cope or upper half of the flask; Fig. 5 is a sectional view taken on the line 55 of Fig. 4; Fig. 6 is a plan view of the drag or lower half of the flask; Fig. 7 is a sectional View taken on the line 7-7 of Fig. 6; Fig. 8 is a detail view of the portion marked aa in Fig. 4 looking in the direction of arrow 8*. Fig. 9 is a detail view of the portion marked aa in Fig. 6 looking in the direction of arrow 9 and Fig. 10 is a side view of the spring and clamping member which secures the flask parts together.

The flask comprises the drag or lower half 1, the cope or upper half 2, the cover 3 and the spring or clamping member 4. The lower half or drag 1 is cup-shaped and has the floor or bottom 5, and integral therewith the heart-shaped upstanding sides 6. It is also provided with the outwardly extending lugs 27 and the three lugs or ears 10, 11 and 12, the latter of which each has a pin receiving opening 13. This lower half is flared outwardly in passing from the bottom to the top thereof, whereby the material providing the mold proper can be readily removed after the shaping and vulcanizing operation has been completed.

The upper half or cope of the flask 1s a heart-shaped ring that is larger at the bottom than at the top in order to permit the ready removal of the mold forming material from this part of the flask. The cope 1s provided with the 3 outwardly extending lugs or ears 14,15 and 16, which have depending therefrom the pins 17 that are constructed and arranged to fit into the openings 13 and thus serve as guiding and positioning members when the cope and drag are being assembled. The cope and the drag are also both provided with the V-shaped guide members 18 and 19 that serve as means for retaining the molding material in its proper position in the flask, wherebythe matrices which are provided in the mold forming material that is in said flask parts will always accurately register. The ad jacent ends of the guides 18 and 19 are chamfered or cut ofl".

The cover is provided with 3 depending lugs 20, that flt the interior of thetop portion of the cope of the mold. This'cover also has 3 depending and outwardly extending lugs 21, which are integral with the lugs 20. The lugs 21 enter and fit into recesses 22 that are in the top of the said cope, and due to these depending lugs 20 and 21'the cover will always be accurately positioned on the cope.

When the drag, the cope and the cover are positioned as shown in Fig. 1, the spring 4 can be readily brought to the position where it can hold the parts together. This spring is M -shaped and the integral depending legs 23 thereof catch upon the lugs 27 that are on the drag, while the central knuckle, that is, the portion 24, where the inclined inner members 25 intersect or meet, engages the cover. These depending legs 23 are provided in their lower portions with the the top of the cap. The cap is also provided withthe recessed portions 29 at opposite sides thereof into which the depending legs 23 of the spring enter, as will be manifest from an inspection of Fig. 1.

As is usual in most molding operations, the material providing the mold is preferably flush with the upper contour or face of the drag and with the lower contour or face of the cope. When, however, a vulcanizing operation is to be carried out, the flask parts, due to the manner in which the substance to be molded is necessarily treated, cannot be brought entirely together, and hence in practically all commercial dental vulcanizing operations of the present day it is necessary to frequently remove the flask from the vulcanizer in order to force, as by means of a screw, the flask parts with the molds therein toward each other and against the piece beingvulcanized. This operation, therefore, consequently requires constant attention on the part of the operator. By providing a spring construction, such as is shown in Fig. 1, the flask parts can be and are automatically and continuously pressed toward each other by thespring 4. This spring can be readily removed at the end of the vulcanizing operation by pressing downwardly, for instance on the right half of the spring at the point x, and by subsequently pulling outwardly on the right-hand end y so that the latter will clear the right-hand lug 27. The parts can also be readily assembled by first placing one leg of the spring in place over the left lug 27 and then pressing the part 3 over the right-hand lug 27 until it springs into holding position relative to said last mentioned lug.

While the cope and cover are shown as two separate members, still the cover might be made integral with the heart-shaped ring and the two together would constitute the cope and the invention in its broadest aspects would be realized by such construction.

It will be manifest that the improvements herein set forth are not limited to the pre cise construction and arrangement shown and described as they may be embodied in various forms and modifications without oleparting fro-m the spirit and scope of the invention.

What I claim is:

1. A vulcanizing flask having an upper part provided with a cover, a lower part and an Wl-shaped spring for pressing said parts toward each other, said ti -shaped spring having integral depending legs that engage with and are secured to said lower part when the fiask parts are in assembled position, the spring being constructed so that the central knuckle thereof engages the cover, with which the upper part is provided, in a manner to continuously press the Copies of this upper and the lower parts toward each other at the time when the depending legs are secured to said lower part.

2. A dental flask comprising an upper part having a cover, a lower part, and an M- shaped spring for pressing said parts together, each of which parts is provided with a set of outwardly extending ears, one of which sets of ears have guiding and positioning pins that enter holes in the other set of ears, the lower part also being pro vided with spring holding lugs, the legs of said spring being provided with notched portions that catch upon said spring holding lugs, said spring being constructed and arranged so that when the legs thereof are caught upon said spring holding lugs the central knuckle of the spring will engage the cover of the upper part in such a manner that the spring will forcibly press the upper part against said lower part.

3. A vulcanizing flask having a. drag, a cope ring, a cover and an til-shaped spring, the depending legs of said spring having openings that receive lugs which are on the drag, the spring also being constructed so that when held in place, due to its engagement with the lugs on the drags, the central knuckle of the spring will directly engage the central portion of the cover in such a manner that the spring will continuously force the cover and the cope ring toward the drag.

at. A dental flask of the class described comprising a' drag, a cope ring, a cover and an lVl-shaped spring, the drag being provided with lugs which hold the integral depending legs of the spring, and the spring being constructed so that the central portion of the spring can press continuously directly against the cover when the flask parts are in assembled position with the cope ring between the drag and the cover.

This specification signed and witnessed this 9th day of July, A. D. 1914.

VVTLLTAM E. PAPPERT.

Signed in the presence of G. MGGRANN, EDWIN A. PACKARD.

patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

